Find the leaking pipe first...
Undo the bottom drain hose.
Change damaged pipe;undo jubilee clips.
Pipes from LR supermarket,paddocks or rimmer brothers.
Replace bottom hose.
Refill with anti freeze 50% approx 1 gallon slowly via header tank.
Remove plastic cap at top of engine will help 'bleeding' process.
Retighten plastic cap.
Run engine & check coolant level.